Vortex Optics VIPER XBR 2.5-10X44 CROSSBOW SCOPE - Manual (Page 9)

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1. Loosen the three turret cap retaining screws on the elevation turret
and gently pull the turret cap straight up and off of the turret post. Be
careful not to rotate the turret post.
2. Slide the CRS shims on the center
section of the turret post below the
V-grooved part.
3. Alternate the shim installation direction
180 degrees with each shim. Use only as
many shims as necessary to completely fill
the space. If a shim does not fit, do not
force it in place.
4. After filling the center gap on the post with shims, replace the
elevation cap.
5. Align the turret cap so the “0” mark on the cap lines up with the
“0” reference line on the turret post. Don’t rotate the actual turret
mechanism in the process.
6. Tighten the retaining screws, but do not overtighten. Use of thumb
and forefinger on the short end of the hex wrench will provide sufficient
force.
Setting the CRS Stop and Indexing Elevation Dial
After obtaining a satisfactory zero, the CRS stop can be set using the
following technique:
Step 2
Due to trajectory arc, the initial 8-yard zero will closely correspond to the
desired final 30-yard zero. Move the target back to 30 yards, adjust the scope
to a magnification of 5x and shoot an arrow at the target center. Be sure to
keep your eye centered behind the eyepiece.
Example
Measuring on the target, the arrow strike is 1.2 inches low and 1.8 inches left
of center. Important Note: One MOA will equal .3
inches at 30 yards.
1. Calculate amount of adjustment needed:
Elevation: 1.2 ÷ .3 = 4 MOA
Windage: 1.8 ÷ .3 = 6 MOA
2. Adjust the turrets (each click equals 1 MOA):
Elevation: Rotate the turret up 4 clicks.
Windage: Rotate the turret right 6 clicks.
3. Shoot another arrow to check adjustment and repeat as necessary.
Place the CRS
shims in this
groove.
Once the clearance is tight, do not try to force in another shim.
Example
The arrow strike is 2 inches high and 4 inches to
the right of center.
1. Calculate amount of adjustment needed:
Elevation: 2 ÷ .08 = 25 MOA
Windage: 4 ÷ .08 = 50 MOA
2. Adjust the turrets (each click equals 1 MOA):
Elevation: Rotate the turret down 25 clicks.
Windage: Rotate the turret left 50 clicks.
3. Shoot another arrow to check adjustment and repeat as necessary.